And looking at the request in Fiddler confirms this - it appears that there is no path to /QvAjaxZfc/htc/ from the root of your website under which all the JavaScript and css files which support the ZFC are located.

When you install QVS this should be set up automatically but it's possible that they are pointing to a different website on your server or, as the previous posted suggests, QVS isn't installed at all.

This also will not work if you do not have qlikview server running on the machine. If you are generating the ajax page based off the personal/developer version it will not run as it should without server.